Well, Kennewick Man was just a disaster. And they should never have turned him over to the tribes before a proper analysis was done. IMO, of course. On the other hand, the Native Americans believe(d) that their ancestors were the first people, period. Showing that Kennewick Man wasn't one of them but was Ainu or any other ethnicity blows their beliefs right out of the water. It's the same reason many tribes won't allow their members to give a DNA test.
Kennewick man has not been turned over to the tribes. The litigation is ongoing, and he is being kept at a museum (in storage, not on display) until it is resolved.
Like ancient Rome, we today are once more importing every form of exotic superstition in the hope of finding the right remedy for our sickness.
-- C. G. Jung
Richard Wilhelm: In Memoriam (1930), CW 15: pg. 60